Polarisability of halide ions increases in the order:

  • A
    $F^{-} < Cl^{-} < Br^{-} < I^{-}$
  • B
    $Cl^{-} < Br^{-} < I^{-} < F^{-}$
  • C
    $I^{-} < Br^{-} < Cl^{-} < F^{-}$
  • D
    $F^{-} < Cl^{-} < Br^{-} < I^{-}$

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Polarisability of halide ions increases in the order:

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